# Databases

**Databases are essential for any modern web application and are used in many languages. In this module we teach the theory behind databases while also showing the implementation of a database.**

Below an overview of the week-by-week topics - click on the title to find more details.

{% content-ref url="/pages/-MS3tICBJCeGqi23EEBy" %}
[1 - Introduction to SQL](/courses/introduction-3/course-content/databases/week-1.md)
{% endcontent-ref %}

{% content-ref url="/pages/-MS3tcDYBZ80XioS1UJE" %}
[2 - SQL with Node](/courses/introduction-3/course-content/databases/week-2.md)
{% endcontent-ref %}

{% content-ref url="/pages/-MS3tm7Qa3goGS5Xzr0z" %}
[3 - CRUD with SQL and Node](/courses/introduction-3/course-content/databases/week-3.md)
{% endcontent-ref %}

![](/files/-MYfTxKEryUkkyHUHFPH)


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